Can you reproduce the problem with the following example?

Qt Code: 
  1. #include <QtGui>
  2.  
  3. int main(int argc, char **argv) {
  4.   QApplication app(argc, argv);
  5.   QListWidget *listWidget = new QListWidget;
  6.   for(int i=0;i<100;++i){
  7.     listWidget->addItem("SongOne");
  8.     listWidget->addItem("SongTwo");
  9.     listWidget->addItem("SongThree");
  10.     listWidget->addItem("SongFour");
  11.     listWidget->addItem("SongFive");
  12.   }
  13.   listWidget->setDragDropMode(QAbstractItemView::InternalMove);
  14.   listWidget->setDragEnabled(true);
  15.   listWidget->setAcceptDrops(true);
  16.   listWidget->setDropIndicatorShown(true);
  17.   listWidget->viewport()->setAcceptDrops(true);
  18.   listWidget->setSelectionMode(QAbstractItemView::SingleSelection);
  19.   listWidget->show();
  20.   app.exec();
  21.   delete listWidget;
  22.   return 0;
  23. }
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